diff --git a/tuf/api/metadata.py b/tuf/api/metadata.py
index cdbe0ad9eb..3f7d89b173 100644
--- a/tuf/api/metadata.py
+++ b/tuf/api/metadata.py
@@ -1,3 +1,6 @@
+# Copyright New York University and the TUF contributors
+# SPDX-License-Identifier: MIT OR Apache-2.0
+
 """TUF role metadata model.
 
 This module provides container classes for TUF role metadata, including methods
diff --git a/tuf/api/serialization/__init__.py b/tuf/api/serialization/__init__.py
index 0866214633..6089add4ac 100644
--- a/tuf/api/serialization/__init__.py
+++ b/tuf/api/serialization/__init__.py
@@ -1,3 +1,6 @@
+# Copyright New York University and the TUF contributors
+# SPDX-License-Identifier: MIT OR Apache-2.0
+
 """TUF role metadata de/serialization.
 
 This sub-package provides abstract base classes and concrete implementations to
diff --git a/tuf/api/serialization/json.py b/tuf/api/serialization/json.py
index 602fbf59c0..1faaf6afd8 100644
--- a/tuf/api/serialization/json.py
+++ b/tuf/api/serialization/json.py
@@ -1,3 +1,6 @@
+# Copyright New York University and the TUF contributors
+# SPDX-License-Identifier: MIT OR Apache-2.0
+
 """TUF role metadata JSON serialization and deserialization.
 
 This module provides concrete implementations to serialize and deserialize TUF